Has anyone tried injection water into the exhaust of an nsr, i no the works bikes use to do it to get more power, and i no of a few rgv250 that have had some success with it.

i can see it being that hard to set-up

Water into the exhaust?

You can inject water in the inlet to cool the in-cylinder temps, which also prevents det, but I've never head of it into the exhaust!?

Barry_MC21 wrote:
You can inject water in the inlet to cool the in-cylinder temps...

Yes, a popular addition to a turbo car, but a 2-stroke works differently. Injecting water into the exhaust can modify the "2-stroke pulse" and therefore effects the back pressure needed to prevent the new intake charge from escaping before the piston closes the ports off.
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Andy.
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Yep, lots of experience with turbo'd cars, wasn't aware of the effect it had on 2-strokes.

As I am in research mode today, have a look here:

MSD Water Injection Kit

This kit is for watercraft, but I dare say it could be used in other applications. Knowing MSD, they will likely have a motorcycle kit available anyway.
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I've done some research into this area as well because I also own a RG500 Gamma. A guy named Randy Norian has done a number of mods to his RG500 which includes water injection. He does an excellent job of explaining what it does.

Here is the link:

http://homepage.mac.com/rg500delta/deltaphasetwo/

Go to the bottom of the menu and click on water injection.

To do this properly you need to know when to start the mist of water in relation to the power valves opening/closing. I'm not exactly sure but I believe you don't actually gain horsepower but the peak torque just hits earlier.

I thought about doing it on my RG500 but I don't like the idea of having sludge buildup in my pipes caused by the water.

Only problem I can see with doing it on a NSR is you may need to alter the powervalve opening and closing range depending on the pipes you use. On the RG500 there is a box modification that will allow us to alter the powervalve operation. Not sure if you can do this on an NSR. The other problem I can possibly see is the powervalve must be open and closed completely for it to work properly. I think the NSR has a progressive powervalve...not sure.

Imagine, you can have a button that turns on the water injection when needed to change the torque characteristics. That would be cool

I had a go at this on my TDR a while ago, only a much cheaper version (£15). The basic set-up was a 1.5L bottle, with a windscreen washer motor at the bottom. This fed through a one-way valve, a T-piece, and a couple of banjo bolts into the headers. The water was turned on via the horn switch (just like nitrous used to be done!).

I experimented with various things, and the best result came with no jets in the system, just a slow flow of water into the pipes (using small jets only produced a fast squirt, like a windscreen washer in fact, but flowed the same amount of water as open banjo's) I think the fast stream just squirted right through the gas and didn't vapourise until later in the pipe, wheeas the slow stream spent more time in the gas flow and worked alot better. (Yeah I know it should be a mist....but I'm not spending money on a high pressure pump and proper jets) There's no build up of water in the pipes, as the heat soon vapourises it (unless the one-way valve sticks as I found one morning with water spraying out the pipe as I started it..I got a proper valve after that)



I used it on my first set of pipes, which were a little more revvy than stock. With the horn button pressed power came in about 1000rpm earlier, and noticabley dropped off earlier, so I'd release the button at 8000 and it'd fly off through the top-end as normal. It worked quite well for a budget version, and quite a nice gimmick to brag about.

Since then I've made a new set of pipes which are alot better in the midrange, and so I haven't felt the need to try water into these yet, though I suppose it would make them even more grunty.

As a little experiment I found I could also increase the midrange a little by using 2-3 exhaust gaskets, effectively lenghtening the pipes and retuning their rpm range.

your one celver man Martin,you could try different pumps,try headlight washer pumps as they are higher pressure than windscreen washer pumps.

nsr.wayne wrote:You're one clever man Martin..."

And that'll be why I pounced on him and asked him to develop some race pipes in the very near future whilst at the dyno-day!
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Andy.
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He should be working for someone like Tyga,but thier loss is our gain

Martin are you going to do the next trackday?

At Llandow? erm, I wasn't planning to. a) I ain't got a car licence so getting there would involve riding there and back.. and b) money, I ain't got no income (for the time being...)

If I could blag a lift I'd be up for lending a hand to anyone that needs it?

And there are loads of people more cleverer than what I is... I employ the enthusiasm over lack of experience, divided by lack of budget technique.

if you just want to come for the day and not ride you could ask Stephen(his a very nice young man)and see in you could jump in with him and Andy

Due to the number of NSRs we are possibly bringing with us, we may be coming up in two vans anyway, so there would certainly be a spare seat if that were the case.
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well, there you go martin,we will see you there